Ribbon mechanism.



J. KELLER.

RIBBON MECHANISM.

APPLICATION FILED 001. 24, 1913.

1,101,633, Patented June 3019M g5 20 LL N Q h lmmlll il xll ll S A SPAT TN .OFFICE-- 1 .JULIU'S KELLER, or roan DU m, WISCONSIN, .assrenoii. r smears .rirrnwmrsa muracroamecomramr, or'ronnnu Lac, wrsc'bnsm, a conrqmr on or wrsoo'nsm.

' nmnon mnon'aivrsm.

To all whom it ma concern."

Be'.it" known -t at I,"-JULIUs Ksnnna, a citizen at the United States, residing: at vFond du Lac, in the countypf-F'ond du Lacand State of;Wisconsii1',-'ha've invented cer- I I It is common of typewritinglmachines from the springtain new and useful Improvements in Rib: bon Mechanism, of which the following is. a specification.

to drive the ribbon spools actuated drum .by which the carriage is ad- 16 direction to drive the parts, and therefore" vanced. In such an arrangement whenever.

the feed of. the. ribbonis stopped,'-the driving drum-will be held against rotation in the the carriage will not beiadvanced.

, This invention contemplates :novel' means for automatically eil'ecting a temporary disconnection betweenthe ribbon ,spools and their driving means whenever the feed of .the ribbon is stopped forany' cause while the machine is in use, so that the travel of the carriagewill not be interrupted.

"I, have herein shown the invention as embodied in a ty ewriter in which the reversal of the ribbon eed is effected by means actuated by the'operator. In s'uch'a machine if the. operator fails to notice that the ribbonis all unwound from one spool, the winding means,a-nd therefore the carriage, will .come. to.a stop. By being'stopped n this way,

- considerable strain is placed upon the parts,

' which is objectionable.

i ever the winding is interrupted, whether Furthermore, the parts sometimes bind, or stick, so that 1t 1s annoyance to the operator; e mechanism herein disclosedywhencausin In tl i from the ribbon being"entirely unwound from a spool, or from any'other cause, thearrangement is such that a pair of ribbon driving gears will-be forced .out of mesh,

' so as to; disconnect the ribbon spools from the spring-actuated driving drum andlthus 'permitthe'carriage to advance freely.

In the accompan ing drawings, Figure -1 is a fragmentary eevational view from the right-hand side of a typgwriter illustrating a ribbon mechanism em tailed view of certain parts seen in Fig: 2, but showing said parts in a different POSI- .tion. Fig.- 4 is F mechanism.

,a toothed wheel 8 rigid on the sha means of these parts the shaft-5 is rotated difficult to actuate the reversing means-thus wheel, but is dying the features, of my invention. Fig. 2 is a front view of the mechanism. Fig. 3 is an enlarged. de-

' said In s a' plan view ofv a portion of v Specification 0! Letters retell t. Patented June 30, 1914;1- Application filed October-24, 191 3. Berle 1R0. 797,082. f

nism which constitutes the I will herein describe in detail a mecha-. p I preferred -em-" bodlment of-my invention, without'thereby intending to. limit the inventioh to the exact arrangement orcombinatien described.

The novel features of themechanismiwill be'pointed'out in theclaiins. I The spring-actuated drum which furnishes power fordrivin the .carria eand the ribbon spools is in icated by -"t e numeral .1, 2 being the tape or cord attached and connected to" the carriage at its other to the drumiland meshes with a pinion 4 to and passing around' said drum at one end disk, 6 is. fixed 'with relation to the pinion 4 v and carriesa pawl 7 whichengatges with t 5. By

to drive the ribbon spools when the drum 1 is rotated in one direction. A retaining awl 9 mounted on, a suitable stationary brac :et 10,

engageswith the toothed wheel 8 and-prevents rotationof the shaft 5 in the opposite-direction. On the forward end of the shaft 5,is L

fixed a worm 10 which mesheswith a wormwheel 11 mounted on a shaft 12 which extends across the .typewriting machine. Said shaft is mounted" for longitudinal slidingmovement in suitable hearings in .the upper ends of-stationary frame pieces 13 and 23; A cap piece 14 is secured by screws 15 to the upper end of the frame piece 13 and overlies the shaft 12 in its bearmg. The cap piece. has lugs 16 which lie in a groove 17 in the hub of the worm Wheel 11, and further has lugs 18 which engage the hub 19 of a spiral gear wheel 20, which is loosely rotatable on the shaft l2 The lugs 16-and 18 prevent axial movement of'the worm wheel 11 and the spiral gear 20. The connection (between the shaft 12 and the worm wheel 11 is such that the shaft may slide through said worm non-rotatable with respect to said wheel; On the opposite. end of. the

shaft12 is rotatably mounted another spiralgear 21-which is held from axial movement by lugs 22, engaging the hub of sa dwheel, being mounted upon the 11 per end of t eframe pieccv23, in which the s aft 12 has abearing.

The spiral gears 20 and 21 mesh with spiral gears 24-, which are fixed upon a pair of vertical shafts 25. On the upper ends of these shafts are ,mounted the ribbon spools 25. A pair Of-Lpinions 26 is fixed upon the shaft 12 at the inner side of the spiral gears 20 and 21,- said pinions being arranged to alternately engage with pawls 27 carried by the gears 20' and 21, for the purpose of driving the ribbon spools in opposite direc-. tions. The shaft 12 may be longitudinally shifted'tocarry one ofzthe pinions 26 into position to be engaged-by a pawl '27 by means of a suitable handle 28 having arms embracing the sh'aft 12 'and lying at opposite sides-of a pair of collars 29' fixed on said shaftf'lhe shaft 12 may be held in either one of its operative positions by suitable ineans'he'rein shown as consisting of a lever 30 piv'otedat 30 in a support 31, and held by a spring 32 in either one of two positions,' the spring, causing the lever to snap ,over center.

The for ard'fend of-the' shaft 5 is rotatably mounted in a bearingmember 33, saidmember being tiltably mounted on a pivot 34 ca'rriild byI a lug 35 on the frame member 13;, The bearing memberv33f is offset to forrn-a shoulder 33 havinginclined faces tofen'gage alternately with the end of the lug 3'5 and thus limit the moveme'ntof the bearing member. The bearingb for the rear; end of the shaft 5 is sufficiently loose. to permit a slight lateral downward movement of the shaft with its bearing 33. A plunger 36 is slidably mounted in. a cylinder 37 carried at the outer end of a bracket 38 attached tothe frame member 13. Acoiled spring 39 presses the plun r36 upwardly and tends to hold the sha 5 in its" upper position. in which the worm 10 meshes withthe Worm-wheel 11.." The tension of the spring 38 is such that under ordinary conditions the worms 10and 11 will remain in meslnbut-if the ribbon feed should be interrupted for any reason, tension willl be placed upon the ribbon, the Worm wheel 11 will finally cease rotating, and the continued rotationiof the driving shaft 5 will force the worm 1O downwardly against the action of the spring 38, and temporarily out of mesh with the worm wheel 11. Thus ,even tliough the ribbon spools are at a standstill, the shaft 5 will be permitted to rotate so that the drum 1 may continue to actuate the carriage in the regular way. This action of the driving worm 10 prevents any undue strain upon. the parts of the inechav nis1n,,and also prcvents the parts from gears in mhsh and peru'iitifing the gears t0 tending from front to back of the machine said slip out of mesh when undue strain is placed upon the parts. i

2. In a typewriting machine, the combi- 1 nation with the ribbon spo0ls,'of driving means therefor includinga pair of gears, a movable bearing for one of said'gears, and a spring tending to hold said gears in mesh, and permitting the gears to slip out of mesh when undue strain is placed upon the parts.

3. In a typewriting machine, the combination with the ribbon spools, of driving means including a worm-Wheel, a rotary shaft arranged to have a lateral movement, a worm 'fixed'on said shaft, and adapted to mesh with said worm-wheel, and spring means tendingto hold said shaft in the position with said worms in mesh, and arranged to permit the worms to slip out of mesh when undue strain is placed on the parts. 7 w

4. vIn a typewriting machine, the combi nation 'Witha pair of vertical ribbon spool shafts, spools thereon, a springractuated carriage-advancing drum, a rotary shaft exand o eratively connected at its rear end to mm, a shaft extending transversely of the machine and operatively connected to said ribbon spoolshaft, intermeshing gears on said transverse shaft and said front-andback shaft, and spring means tending to 5. In a .typewriting machine, in combination, a spring-actuated carriage-advancing drum, a'shaft extendingfrom front to rear of the machine and operatively connected tosaid drum at its rear end, amovable bearing for the forward end of said shaft, a pair of ribbon spools, a gear op-' eratively connected to the ribbon spools for driving them, a gear fixed on the forward end of the first mentioned shaft and meshing with the first mentioned gear, and spring means tending to'hold the bearing in position with said gears in mesh. 6. In a typewriting machine, the combination with the supporting framework and the spring actuated carriage advancing drum mounted therein, of a rotaryshaft extending from front to rear atone side of the machine, and operatively connected at its rear end to said drum, the rear end 7 of said shaft having a bearing in the frame-v work which permitsrlateral swinging movement of the forward end of the shaft, a bearing pivoted. in the framework and sup :rpa ir of ribbon spools opcrativcly connected to the second gear, ,aud a spring-pressed plunger acting on said pivoted bearing, and, 4 tmding to hold said shaft in the position 180 in which said gears are in mesh, said plunger movably mounted bearing in which said being arranged to yield to permit saldgears shaft is mounted, and a spring tending to to sli out of mesh when undue tension is maintain said bearing in the position in place upon the ribbon spools. which said gears are in mesh. is 5 7. In a typewriting machine, the combi- In testimony whereof I hereto afix my sig gation with the ribbon spools, of means fgr nature in presence of two Witnesses. v

rivin t e spools, comprising a rota sha t lnountzd to have a lateral movement ya gear JULIUS KELLER fixed on said shaft, :1 second gear meshing Witnesses: 10 therewith and operatively connected with G. P. HEATHOOTE, the ribbon spools for driving the latter, a ARTHUR GRAF. 

